Muffy is devastated when she finds out that her great grandmother is not royalty, but just a maid; Arthur is faced with peer pressure after calling out Buster during a baseball game; when Rattles's mom begins a relationship with Archie Vanderloo, Archie soon begns to spend more time with Archie's kids; things suddenly go awry when Arthur offers to babysit so that his parents can relax in the backyard.

When the members can't agree on the club's rules, they each set up their own club. Then, Sue Ellen becomes obsessed with the Internet game Virtualgoose.com and starts seeing her friends as geese to be conquered. Next, another computer game inspires a real-life camping trip.

In the 1st episode Arthur learns the meaning of the word "teamwork" during the baseball season. In the 2nd episode Francine makes a bet with Muffy to be nice to everyone for a whole week. In the 3rd episode Arthur just can't stop losing.

Eight-year-old Arthur Read and his family and friends have a series of adventures.